Mary Louise Butcher "Polly" Hill (January 30, 1907 – April 25, 2007) was an American horticulturist best known for testing how well plants could survive in cold climates.
She founded the Polly Hill Arboretum on Martha's Vineyard, Massachusetts.
She went to Japan to teach English and learned about flower arrangement there.
[citation needed] After returning to the United States, she studied botany and horticulture at the University of Maryland.
[citation needed] Hill died in Hockessin, Delaware at age 100.